EP1825716A1 - Safety device for detecting electrode breakage - Google Patents
Safety device for detecting electrode breakageInfo
- Publication number
- EP1825716A1 EP1825716A1 EP05850287A EP05850287A EP1825716A1 EP 1825716 A1 EP1825716 A1 EP 1825716A1 EP 05850287 A EP05850287 A EP 05850287A EP 05850287 A EP05850287 A EP 05850287A EP 1825716 A1 EP1825716 A1 EP 1825716A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- line
- safety device
- protection plate
- radiation protection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001681 protective effect Effects 0.000 claims abstract description 9
- 238000010891 electric arc Methods 0.000 claims abstract description 8
- 230000005855 radiation Effects 0.000 claims description 27
- 239000007921 spray Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002968 anti-fracture Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
- H05B7/101—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/12—Arrangements for cooling, sealing or protecting electrodes
Definitions
- the invention relates to a safety device for detecting an electrode fracture in an electric arc furnace, wherein an electrode is attached to a E lektrodentragarm.
- a warning signal for the detection of the electrode breakage is generated by the fact that, in the case of a line which is filled with a medium which is subjected to a constant pressure, a pressure drop occurs in the event of an electrode break.
- Electric arc furnace find use as melter units for the production of steel in particular.
- the electric arc furnace is filled from above with swung lid with scrap and other feedstocks and can melt the batch with the arc of the electrodes that protrude through the lid into the oven.
- the electrodes are attached to Elektrodentragarmen and are adjusted according to the burn-up.
- the electrode support arms as supports for the electrodes are usually current-leading and thus ensure the flow of current into the electrodes.
- DE 28 13 739 A1 assumes, for example, that a circuit monitors the current through the electrode and that a warning signal is generated which indicates the electrode break when the interruption of the current flow is exceeded for a predetermined period of time.
- the generic GB 2 037 549 A discloses a water-cooled electrode in which a pneumatic fracture protection is provided. Inert gas is brought to this connection surface via corresponding lines, which are arranged axially in the electrode inner body and which pass through a transition region in the front-side connecting surface between metal sleeve and wearing part. In this case, a constant pressure is applied, and a decrease in the pressure serves as a signal of the abort of the consumable part of the electrode.
- This system has the disadvantage that no conventional electrodes can be used, but the electrode must be provided with lines running in its interior.
- the object of the invention is to propose a safety device for detecting an electrode breakage, with which the disadvantages of the prior art are overcome.
- an effective securing device is to be achieved which can be used in conventional electrodes.
- the core of the invention is that a line filled with a medium, which undergoes a pressure drop in the event of an electrode breakage, is not integrated in the electrode itself but is arranged below the electrode on the electrode support arm as a separate device in the sense of a separate protective component. This has the advantage that even existing facilities can be retrofitted with this system.
- the electrode support arm preferably has a radiation protection plate, into which the pressurized line, which is closed at one end, is integrated.
- This line is preferably supplied with air.
- a hole is burned in the radiation protection plate and thus in the pressurized line. The pressure collapses, providing a signal to shut down the melting energy.
- the electrode is surrounded by a ring line, wherein the ring, which is not formed continuously, receives the pressurized medium and acts according to the radiation protection plate as a protective component. It is recommended to connect the ring to the radiation protection plate and in this way to guide the detection or conduction system close to the electrode body.
- the radiation plate can be connected to the spray ring for cooling the electrode body.
- FIG. 1 shows an electrode support arm with a clamp arrangement for an electrode and the safety device according to the invention with a radiation protection plate with a first line profile pattern;
- FIG. 2 shows a section through the securing device with a radiation protection plate having a second line course pattern
- FIG. 3 shows a section through the securing device and a protective ring arranged thereon
- FIG. 4 shows a side view of the securing device with a spray ring
- a safety device 1 for detecting an electrode break which is composed of a radiation protection plate 2 and a spray ring 14.
- the radiation protection plate 2 is fastened to the electrode support arm 4, which receives an electrode 6 (see Fig. 4) via a clamp arrangement 5.
- the electrode 6 is locked via a correspondingly shaped contact shoe (not shown) and supplied with power.
- the electrode support arm 4 protrudes beyond the electric arc furnace not shown here.
- a line 7a of a first pattern is integrated in the radiation protection plate 2 or in the radiation protection plate. For this line 7a is only one input
- a second line trace pattern is shown in FIG.
- the detection line 7b is integrated in the radiation protection plate 2 and is supplied via the feed line 11 shown here.
- the line 7b continues in a spiral manner in the radiation protection plate 2. In this way, a high degree of coverage of the line 7b in relation to the plate surface is achieved, so that in the event of a fault, a line region is hit with high probability by the arc.
- the line 7b itself ends again in the central region 10 of the radiation protection plate 2.
- a spray ring 14 is arranged at the radiation protection plate 2.
- FIG. 3 shows that the air-acted pipeline 7c of the radiation protection plate 2 extends into the pipeline of a ring 3 arranged thereon.
- the line runs meandering through the radiation protection plate 2 and ends in the two ring ends 12, 13, which are not connected to each other.
- the line is under pressure.
- FIG. 4 shows a line variant in which a radiation protection plate 2 is provided with a ring 3 and with a spraying ring 14 arranged at a height offset.
- the ring 3 is arranged above the spray ring 14.
- the operation of the safety device is as follows. If an electrode breaks, the arc occurs between the broken end of the electrode and the electrode support arm. The arc burns a hole in the line in the radiation protection plate and / or in the ring. The result is a pressure drop, which is detected as a signal for the accident, the melt stream can be switched off. LIST OF REFERENCE NUMBERS
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Furnace Details (AREA)
- Discharge Heating (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Auxiliary Devices For Machine Tools (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004060826A DE102004060826A1 (en) | 2004-12-17 | 2004-12-17 | Safety device for the detection of electrode breaks |
PCT/EP2005/013573 WO2006066817A1 (en) | 2004-12-17 | 2005-12-16 | Safety device for detecting electrode breakage |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1825716A1 true EP1825716A1 (en) | 2007-08-29 |
EP1825716B1 EP1825716B1 (en) | 2008-06-25 |
Family
ID=36051590
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05850287A Not-in-force EP1825716B1 (en) | 2004-12-17 | 2005-12-16 | Safety device for detecting electrode breakage |
Country Status (10)
Country | Link |
---|---|
US (1) | US8654813B2 (en) |
EP (1) | EP1825716B1 (en) |
JP (1) | JP4897700B2 (en) |
KR (1) | KR101204715B1 (en) |
CN (1) | CN100525553C (en) |
AT (1) | ATE399451T1 (en) |
CA (1) | CA2590809C (en) |
DE (2) | DE102004060826A1 (en) |
ES (1) | ES2306286T3 (en) |
WO (1) | WO2006066817A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102008006966A1 (en) * | 2008-01-31 | 2009-08-06 | Siemens Aktiengesellschaft | Method for determining a measure of the dimensions of solid in an electric arc furnace, an electric arc furnace, a signal processing device and program code and a storage medium |
DE102008006958A1 (en) * | 2008-01-31 | 2009-08-06 | Siemens Aktiengesellschaft | Method for operating an electric arc furnace with at least one electrode, regulating and / or control device, machine-readable program code, data carrier and electric arc furnace for carrying out the method |
DE102008006965A1 (en) * | 2008-01-31 | 2009-08-06 | Siemens Aktiengesellschaft | Method for determining a radiation measure for a thermal radiation, electric arc furnace, a signal processing device and program code and a storage medium for carrying out the method |
DE102010052086A1 (en) | 2010-03-10 | 2011-09-15 | Sms Siemag Ag | Elektrodentragarmsystem |
CN115595400B (en) * | 2022-10-22 | 2024-05-14 | 永兴县永和贵金属有限责任公司 | Three-electrode AC/DC electric smelting furnace |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2386260A (en) * | 1943-09-16 | 1945-10-09 | Payne William Harvey | Mounting for electric arc furnace electrodes |
JPS527046A (en) | 1975-07-07 | 1977-01-19 | Ishikawajima Harima Heavy Ind Co Ltd | Detector of consumption and breakage of electrode |
US4287381A (en) * | 1978-12-19 | 1981-09-01 | British Steel Corporation | Electric arc furnace electrodes |
FR2458594A1 (en) * | 1979-06-06 | 1981-01-02 | Heurtey Metallurgie | IMPROVEMENTS TO POCKET STEEL PROCESSING PLANTS |
NO802264L (en) * | 1980-07-25 | 1982-01-26 | Elkem Spigerverket As | KEEPING FOR AN ELECTRODE IN ELECTRIC Melting Ovens. |
JPH0227690A (en) * | 1988-07-15 | 1990-01-30 | Showa Denko Kk | Electrode cooling method for steel making arc furnace |
US4852120A (en) * | 1988-11-08 | 1989-07-25 | Nikko Industry Co., Ltd. | Cooling apparatus for electric arc furnace electrodes |
AUPN595095A0 (en) * | 1995-10-16 | 1995-11-09 | Bhp Steel (Jla) Pty Limited | Heating molten metal |
US6214286B1 (en) * | 1997-12-01 | 2001-04-10 | Howmet Research Corporation | Hybrid induction skull melting |
UA80479C2 (en) * | 2002-09-20 | 2007-09-25 | Electrode column of an active furnace and a method of determining the electrode length | |
US20090050757A1 (en) | 2007-08-20 | 2009-02-26 | Oh Sung I | Mount System Adapted to Rotate and Extend a Monitor |
-
2004
- 2004-12-17 DE DE102004060826A patent/DE102004060826A1/en not_active Withdrawn
-
2005
- 2005-12-16 CN CNB2005800433524A patent/CN100525553C/en not_active Expired - Fee Related
- 2005-12-16 EP EP05850287A patent/EP1825716B1/en not_active Not-in-force
- 2005-12-16 JP JP2007545964A patent/JP4897700B2/en not_active Expired - Fee Related
- 2005-12-16 DE DE502005004544T patent/DE502005004544D1/en active Active
- 2005-12-16 AT AT05850287T patent/ATE399451T1/en active
- 2005-12-16 US US11/793,408 patent/US8654813B2/en not_active Expired - Fee Related
- 2005-12-16 CA CA2590809A patent/CA2590809C/en not_active Expired - Fee Related
- 2005-12-16 WO PCT/EP2005/013573 patent/WO2006066817A1/en active IP Right Grant
- 2005-12-16 ES ES05850287T patent/ES2306286T3/en active Active
- 2005-12-16 KR KR1020067017333A patent/KR101204715B1/en active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO2006066817A1 * |
Also Published As
Publication number | Publication date |
---|---|
EP1825716B1 (en) | 2008-06-25 |
CA2590809C (en) | 2013-12-10 |
KR20070096780A (en) | 2007-10-02 |
ES2306286T3 (en) | 2008-11-01 |
ATE399451T1 (en) | 2008-07-15 |
US8654813B2 (en) | 2014-02-18 |
CN101080948A (en) | 2007-11-28 |
DE502005004544D1 (en) | 2008-08-07 |
CN100525553C (en) | 2009-08-05 |
KR101204715B1 (en) | 2012-11-26 |
US20080304538A1 (en) | 2008-12-11 |
JP4897700B2 (en) | 2012-03-14 |
DE102004060826A1 (en) | 2006-06-29 |
CA2590809A1 (en) | 2006-06-29 |
WO2006066817A1 (en) | 2006-06-29 |
JP2008524784A (en) | 2008-07-10 |
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